Write a function that evaluates ex as $1\mathrm{.}0+$ x $/1!+$ x$2/2!+$ x$3/3!+...$ xn$/$ n$!.$ Write a main program where user inputs number of terms and value of x and passes to the function. The function evaluates ex and returns the result to the main program where it is printed. The main program should use a sentinel loop to call the function several times.